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    <script>
        // ES6允许给函数参数赋初始值
        // 1.形参初始值 具有默认值的参数，一般位置要靠后(否则没有意义)

        function add(a, b, c = 10) {
            return a + b + c;
        }
        let result = add(1, 2, 3);
        console.log(result);

        // 与解构赋值结合使用
        function connent({ host = "127.0.0.1", username, password, port }) {
            console.log(host);
            console.log(username);
            console.log(password);
            console.log(port);
            console.log("连接成功");

        }
        connent({
            // host: "127.0.0.1",
            username: "root",
            password: "123456",
            port: 3306
        })

    </script>

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